METHOD OF GAS SENSOR CALIBRATION Russian patent published in 2008 - IPC G01N27/12 

FIELD: chemistry.

SUBSTANCE: method of gas sensor calibration, lying in determining dependence of gas-sensibility S of located in measuring chamber sensor on the basis of tin oxide film on concentration C of admixture in gas-air sample S=S(C), consists of two stages - 1) calibration and b) measurement. According to invention, measuring chamber with adjacent gas pipelines is calibrated by locating in it sensor, for which known are dependence of conductivity G on concentration G=G(C) and dependence of conductivity on time G=G(t) with step-by-step changing of environment composition for one of gas-air samples, a well as calculated from last dependence characteristic time of conductivity reaching stationary state τ_O, then chamber is blown with clean air is, which is then step-by-step changed for calibrating gas-air sample with known concentration, and dependence of sensor conductivity on time G(t) is measured, characteristic time of film conductivity reaching stationary value τ is calculated, rate of blowing chamber with adjacent gas pipelines is reduced, and operations are repeated until value τ does not become essentially greater than value of τ_O, rate of blowing is fixed, from dependence G(t)=G[C(t)], using known for calibrating sample dependence G(C), dependence of admixture concentration in measuring chamber on time C(t) is determined, after calibration chamber is washed with clean air preserving rate of blowing at fixed level, blowing air is step-by-step changed for examined sample, blown with the same rate, dependence of film conductivity on time G(t) is measured, from dependence G(t)=G[C(t)], using known from calibration for the given chamber with adjacent gas-pipelines dependence C(t), dependence of film conductivity on admixture concentration in measuring chamber is determined, basing on which dependence of gas-sensibility on concentration S(C) is calculated.

EFFECT: extension of arsenal of calibration methods, reduction of time of sensor calibration - reduction of time for obtaining dependence of sensor signal on admixture concentration, including unknown type, in gas-air mixture under examination.

2 cl, 10 dwg